{"id":"c159cfec-b746-407e-bb28-9957ce1dc9f6","shortId":"7S3jQR","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-gated API resources offered by the platform. The specific resource `/api/v1/generate/resource/63` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader lowpaymentfee.com platform offers endpoints spanning four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints share the same $0.02 per-request pricing with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no actual technical documentation, request/response schemas, or usage examples. The specific functionality behind `/api/v1/generate/resource/63` is unclear — it is not listed among the publicly advertised endpoints on the homepage, so its exact purpose cannot be determined from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific endpoint /api/v1/generate/resource/63 is not listed among the publicly advertised endpoints on the homepage","No request or response schema is available; the actual functionality of this endpoint is unknown","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/63","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/generate/resource/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the specific resource/63 endpoint is not listed among the site's advertised APIs. The purpose of this particular endpoint is 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'/request':13,28,97 '0.02':12,27,87,96,148 '000':78 '20':77 '402 payment endpoint' '6':83 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56 'across':99 'actual':186 'advertis':72,208 'ai':118 'among':205 'amount':75 'analysi':122 'analyt':112 'api':6,21,42,55,155,172 'avail':221 'base':9,24,67,79 'base-network' 'behind':197 'broader':103 'call':4,19 'cannot':217 'categori':110 'challeng':71 'classif':125 'commit':163 'connect':181 'consist':90 'convers':141 'crypto-paid API' 'data':111,115 'decim':84 'determin':219 'doc':171 'document':166,188 'embed':126 'endpoint':32,101,107,144,209 'equal':86 'estim':136 'exact':215 'exampl':193 'exchang':131 'export':116 'extrem':168 'feed':130 'financ':127 'four':109 'function':196 'gas':135 'gate':41 'generat':142 'geocod':139 'homepag':212 'howev':165 'infrastructur':138 'insight':117 'key':156 'label':53 'learn':120 'limit':159 'list':204 'lowpaymentfee' 'lowpaymentfee.com':34,104 'machin':119 'mani':38 'materi':222 'max':74 'metric':113 'minimum':162 'network':68 'no-api-key' 'offer':44,106 'one':36 'page':176 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':62 'per':3,18,88,150 'per-request':149 'platform':47,105 'post':59 'post-method' 'premium':5,20,54 'price':98,129,152,173 'prompt':183 'public':207 'purpos':216 'quot':134 'rate':132,158 'readm':175 'render':178 'report':114 'request':60,89,151 'request/response':189 'requir':164 'resourc':43,50 'schema':190 'sentiment':121 'settl':61 'share':145 'site':93 'span':108 'spars':169 'specif':49,195 'summar':124 'technic':187 'text':123 'token':133 'unclear':200 'uniform':95 'unit':80 'usag':192 'usdc':15,30,64,82 'usdc-settlement' 'valid':140 'via':10,25 'wallet':182 'web3':128 'x402':11,26,40,70 'x402 API' 'x402-gated':39 'x402-payment'","prices":[{"id":"f3dbaf5b-6139-4e20-a720-e37b9724eceb","listingId":"c159cfec-b746-407e-bb28-9957ce1dc9f6","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/generate/resource/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:30.680Z"}],"sources":[{"listingId":"c159cfec-b746-407e-bb28-9957ce1dc9f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:30.680Z","lastSeenAt":"2026-04-24T11:31:42.271Z"}],"details":{"listingId":"c159cfec-b746-407e-bb28-9957ce1dc9f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/63"},{"claim":"The platform advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, per-request API access"],"bestFor":["Developers who want to pay per request without subscriptions","AI agents that can settle x402 payments autonomously","Users with USDC on Base who need instant API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who prefer bulk pricing or subscription plans","Developers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.633Z"},"updatedAt":"2026-04-24T11:31:42.271Z"}}